package com.sky.service.impl;

import com.alibaba.fastjson.JSON;
import com.alibaba.fastjson.JSONObject;

import com.sky.constant.MessageConstant;
import com.sky.dto.UserLoginDTO;
import com.sky.entity.User;
import com.sky.exception.LoginFailedException;
import com.sky.mapper.UserMapper;
import com.sky.properties.WeChatProperties;
import com.sky.service.UserService;
import com.sky.utils.HttpClientUtil;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

import java.time.LocalDateTime;
import java.util.HashMap;
import java.util.Map;

@Service
public class UserServiceImpl implements UserService {

    @Autowired
    private WeChatProperties weChatProperties;
    @Autowired
    private UserMapper userMapper;

    public final static String WX_LOGIN="https://api.weixin.qq.com/sns/jscode2session";
    @Override
    /**
     * 微信登录
     */
    public User wxLogin(UserLoginDTO userLoginDTO) {

        String openid = getOpenid(userLoginDTO.getCode());
        //判断openid是否为空，如果为空，抛出业务异常
        if (openid==null){
            throw new LoginFailedException(MessageConstant.LOGIN_FAILED);
        }

        //判断当前用户是否是新用户
        User user=userMapper.getByopenid(openid);
        if(user == null){
            user=User.builder()
                    .openid(openid)
                    .createTime(LocalDateTime.now())
                    .build();
            //如果是新用户，自动完成注册
            userMapper.insert(user);
        }

        //返回用户对象
        return user;
    }

    /**微信接口服务，获取openid
     * 调用
     * @param code
     * @return
     */
    private String getOpenid(String code){
        //调用微信接口服务，获取用户openid
        Map<String, String> map=new HashMap<>();
        map.put("appid",weChatProperties.getAppid());
        map.put("secret",weChatProperties.getSecret());
        map.put("js_code", code);
        map.put("grant_type","authorization_code");
        String json= HttpClientUtil.doGet(WX_LOGIN,map);

        JSONObject jsonObject= JSON.parseObject(json);
        String openid=jsonObject.getString("openid");
        return openid;
    }
}
